Paper-pulp-assorting apparatus.



PATENTBD FEB. 6, 19.06.

B. KIHLGREN. PAPER PULP ASSORTING APPARATUS.

APPLICATION FILED MAY 19, 1905,

2 SHEETS SHEET 1v No. 811,930. -PATENTED FEB. 6, 1906.

' B. KIHLGREN.

PAPER PULP ASSORTING APPARATUS. APPLICATION FILED MAY19,1905

2 SHEETSSHEET 2.

waif 175619.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed May 19, 1905. Serial No. 261,264.

To all whom it may concern:

Be it known that I, BERNHARD KIHLGREN, a subject of the King of Sweden and Norway,

and a resident of Holyoke, in the county of.

Hampden and State of Massachusetts, have invented certain new and useful Improvements in Paper-Pulp-Assorting Apparatuses, of which the following is a full, clear, and exact description.

The subject of this inventionis an improved machine or apparatus for screening paperpulp, especially for separating and removing such portions of the pulp as it comes to the screening-machine from the flow-box as are not thoroughly comminuted or digested, the

screened pulp being delivered through a headbox or otherwise to a paper-machine, and the coarse or indigested portions 'which have not passed through the screen are excluded from the screening-machine and reclaimed to be further worked up.

The apparatus may properly. be consid ered one for assorting wood, chemical, or other kind of pulp for paper into two grades, one having a uniformity in fineness of fiber and texture and the other being coarser and more or less uneven or containing splinters.

With the above and other purposes in view this machine has for a principal object the provision of a powerful centrifugal device for causing the passage of the paper-pulp through the screen and obviously in a more rapid, positive, and thorough manner than is the case with the commonly-employed gravityoperated screen-boxes.

Another object of this invention is to provide, in connection with the casingof the machine, having suitable outlctopenings, improved means for regulating the ingress into said casing of the pulp supplied thereto from the flow-box or other source.

A- further object is to provide, in connection with the novel form of screen employed and the wet pulp screened therethrough, an auxiliary supply of Water to augment the amount of water the pulp is iloated in, and especially to compensate for the more rapid initial expulsion through the screen of the pulp-carrying water relative to the pulp carried thereby.

There are other important features connected with the invention which, in addition to those alluded to, are clearly set forth in the follmving detailed description.

The invention includes the combination, with a casing having an outlet and a screen of partially cylindrical form within and separated from the walls of said casing and having both an inlet for the wet pulp to be assorted and acoarse-pulp outlet, and a device for forcing the pulp introduced within the screen inradial directions against the screen-walls,

whereby the pulp of suitably-fine grade passes through the screen, while the coarse and more or less uneven pulp or slivers restrained within the screen ispermitted to pass through the said coarse-pulp outlet; and the invention furthermore includes, in combination with an apparatus characterized as above, means for supplying water into the lower portion of the screen-inclosed chamber for facilitating the pulp screening or assorting operation or process; and the invention furthermore includes or is constituted by certain particu lar combinations and arrangements of parts and all substantially as hereinafter fully described, and set forth in the claims.

My improved machine for screening pulp for paper is illustrated in the accompanying drawings, in which Figure 1 is a cross-sectional elevation, and Fig. 2 is a longitudinal elevation with portions in section, as taken on a line 2 2, Fig. 1. The line 1 1 on Fig. 2 indicates the lane of section on which the first view is ta en.

In the drawings, A is a partially-cylindrical casing, preferably constructed of sheet metal, its sides and rounded bottom portion being of one continuous plate B, the end edge portions of which are united to the flanged portion b of end lates' C and C. Extending centrally of and ongitudinally through this casing A is a shaft D, which revolves in bearings d and cl, which are provided at either end of the casing A and are supported slightly beyond the end plates C and C on brackets c c, which are formed on said end plates. Shaft 1), having pulley E, is power-driven by belt 0 and has mounted thereon within the casing A and extending longitudinally the entire length thereof the centrifugal curve-bladed wheel F. This centrifugal wheel F, as it will be called, consists of a plurality of radial and suitably-flanged spokes or blade-carrying arms f, to which are secured the blades G. These blades G, which are for a large proportion of their areas flat and radial in arrangement have their inner edge portions -that is, their portions which are the nearer to the axis of the wl1eelconstructed of a curved form and forwardly disposed relatively to the direction of their rotation, as seen at 9,

ICC

Partly surrounding and inclosing this centrifugal wheel F and adjacent the outer edge portions 9 of the blades G thereof are the partially-cylindrical screen-plates H, which together make the major portion of a cylinder. These screen plates are referably made of sheet metal and have istributed over their entire area the closelyarranged perforations h. The annularflanges or ribs I on the end lates O and C form a su port for the end e g3 ortions of the said screenplates to W '0 they are suitablysecured. The lower lon 'tudinallyextending ed es of these screen-p ates are united to a rab eted portion tfLof a horizontal tube J. This tube extends lengthwise of the casing A, its end adjacent end plate being closed, but having its other-end, which'abuts a ainst end plate C, in registration with a ho e j therein. A pipe K from a pump or other source of supply, conveying water therethrough under considerable pressure, has its discharge end 0 same.

posite the perforation j and open end of tu e J, thus'having connection thereinto.

The upper or top side of the casing Ais partially closed by a cover A, theremaining portion of the top of the casing being, as reference to Fig. 1 shows, covered bythe closed end portion of the flOWrbOX L. Near the closed end portion of this flow-box L and about centrally over the casing A is located the sluiceway-opening Z, which communicates with the distributing-box M. A regulating gate-valve 'm is rovided adjacent this sluiceway Z within the ow-box L, and ahand-' wheel-operated screw-rod m, which has engagement with the gate m and has screw engagement with the nut m on the side wall of the flow-box, serves to verticall adjust the size of the sluiceway-opening A thumb locking-nut m serves to confine the gate min its regulated position.

The distributing box M, into which the pulp from the flow-box discharges through the above-described sluiceway Z, has formed therein and extending longitudinally from end to end thereof the partitions M and M The partition M, which is -nearest,the sluiceway-opening l, is attached to the bottom of the distributing box, its top edge reaching only about half-way to the top edges of the The partition M however, extends from the top of the box M about half-way down to the bottom of the box M, its lower edge portion being more or less near the level of the top edge portion ofthe partition M.

A broad discharge-opening 'N from the side of the distributing-box M opposite the sluiceway-opening Z is in extent nearly equal to the length of the centrifugal wheel G. This discharge-opening N is over and a little to one side of the axis of the centrifugal wheel G, onto which wheel the pulp from the flow-box is more or less downwardly directed by the vertical deflector or guard which is supported on the adjacent edge portion of the casing-cover A.

A horizontally-extending outlet P for the screened pulp is provided at the lower portion of the casing A. This outlet P may connect with the head-box of a paper-machine or, as shown in the drawings, with a tank or conveyer-trough P. Near the upper or top portion of the apparatus opposite from the discharge-way P is a second outlet Q, which leads from the approximately cylindrical screen-inclosed chamber.

One edge portion of one of the screenplates 11- terminates at the boundary of an opening H in an inclined board or plate A to a second trough conveyer P.

In operation the centrifugal wheel F is revolved preferably at high speed, by reason of which the unscreened pulp from the flow-box L' and the distributing-box M, which is deflected downward thereonto, is more or less violently forced outward by the centrifu al force exerted by the curved portions of t e blades G, whereby the pulp and water in which it is incorporated is expelled through the perforations of the plate H and is drawn off from the casing A by the outlet P. In order that the thinness of the pulp as mixed with the water in which it is floated may be maintained during its passage over the entire area of the screen-plates H, an additional supply of water to the pulp is provided through the perforated tube,to the end that the latter part of the passage of the pul over the remaining screen area is attende with approximately the same amount of water as during the first half. By reason of this extra supply of water to the pulpduring the operation of screening the same the workis not only more thoroughly done, but the reclaiming of the unscreened coarse portions of the pu p is facilitated. A resultant effect in connection with the use of a centrifu a1 wheel F for the purpose described is t e natural blower capability or tendency of such wheel! This principle I utilize in connection with and as an adjunct to the before-described centrifugal action of the wheel F by providing shaft-openings S S in the casing ends 0 and C, which openings are somewhat larger than the diameter of the shaft D and which permit an ingress of air therethrough. This air is forced outward through the screen perforations h by the same centrifugal force that forces the water-saturated pulp therethrough and results in a somewhat improved screening action.

As represented by the dotted lines at Water-supply pipes may enter the ends of the casin to deliver within the screen-inclosed cham er as a substitute for the pipe J.

It will be here explained that by making the wheel F with the portions of its blades G, which are the nearer to the center of the wheel and the axis of revolution of such blades, forwardly inclined relatively to the direction of movement of such blades the pulp incoming into the screen-inclosed chamer is measurably prevented from flowing down between the wings to the center of the wheel and so across to the lower side ,of the chamber, whereby itwould' avoid and not be subjected in a full degree to the outwardlythrowing action of the Wheel.

I claim 1. In a pulp-assorting apparatus, the com bination with a casing having an outlet-opening, and a, chamber-inclosin screen, within and separated from the walls of the casing, and having a pulp-inlet opening and a pulp outlet opening, of a centrifugal wheel within said screen, having the blades orwings thereof at their portions toward the axis of their revolution inclined forwardly relatively to the direction of rotation of said. wheel.

2. A pulp-assorting apparatus consisting of a casing having an outlet-opening and a chamber-inclosing screen within and separated from the walls of the casing, and having a pulp-inlet opening and a pulp-outlet opening, and also having an air-entrance opening leading through the end of the casing and communicating into the interior of the chamber within the screen, of a centrifugal wheel within said screen, operable to force the pulp outwardly against the said screen, and means I for rotating the said wheel.

3. In a pulp-assorting apparatus, the comscreen-shell having a pulp-entrance opening at its upper portion and to one side of its axis, and having a pulp-residue-outlet opening at an n per portion thereof sidewise opposite from said entrance-opening, of a fan-wheel rotatable within the sereen-inclosed chamber, a chamber-inclosing casing outside of the said screen having a pulp-opening leading from a lower portion thereof, and a watersupply pipe extending longitudinally within the last-named chamber andhaving j et-holes directed through the bottom of the screen.

4. A pulp-asserting apparatus comprising a casing having an outlet-opening, and a chamber-inclosing screen, within and-separated from the walls of the casing, and having pulp inlet and outlet openings leading to and from said screen-inclosed chamber, an axially horizontal centrifugal wheel within said screen, and a water-supply pipe ranging horizontally and in proximity to the screen, and having jet-holes directed substantially toward the wheel-axis and for delivering wa ter under pressure, and distributed, into the screen-inclosed chamber.

Signed by me in presence of two subscribing witnesses.

B. KIHLGREN.

Witnesses WM. S. BELLOWS, G. R. DRISOOLL.

bination with an approximately cylindrical I 

